Improvement in metallic roofing



anni eww A tient (aww Laim Patent No. 102,441, dem Apr/i126 1870.

IMPROVEMENT IN METALLIC ROOFING.

The Schedule referred to 1n these Letters P atent and making prt ofthe same.

To all whom it may concern Be it known that I, JOHN SIDDoNs, ot' Rochester, in the county of Monroe and State of New York, Lhave invented certain new and useful Improvements in Metallic Roofing; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in which- Figure l is a sectional view ot' my invention.

Figure 2 is an enlarged sectional view ofthe double lock-seam and cement.

The object andnature of my invention will be understood by reference to the specification and drawing, and

'lo enable others to make and use the same, I will describe its construction'.

I construct my improved roof' of iron, zinc, or other suitable sheet metal.

The longitudinal joints of the'sheets are made upon the triangular ribs A, by giving both slieets a double fold, b, as shown in the drawing, and fully described in my patent of September 28th, 1869.

Instead, however, of applying a fibrous packing between the sheets at the joint, I use any suitable oily cement or putty, i, which is applied either to the sheets near the edges before they are turned over, or upon the first turn of the seam before it is linally folded down.

The cement L hardens within the fold on exposure, and forms an impervious joint. This is amuch cheaper p lau than using a fibrous packing, since the material is less expensive, and less labor is involved in applying it.

The transverse joint, shown in section in the drawing, is made tight by a 'strip of packing, c, dipped in pil or paint, and interposed between the sheets at the ap.

By my former plan of fastening the sheets wit clinched nails, it was necessary that an assistant be stationed under the roof to clinch them.

Moreover, where a raiter, B, crossed the scam, the,

nails could not be clinched, and the sheet, raising by expansion, would draw 'them out, and also by frost in winter.

To overcome these difficulties I use wood-screws a to secure the sheets to the roof-boards, as shown.

' After the sheets are laid, the holes are punched and counter-sunk at one operation by a suit-able tool, and the screws started bya blow from a hammer. A coat of red lead, or other paint, is now applied to the outside sheet along the seam, envelopingethe screws and filling the countersink-s. 'lhescrews are finally driven down with a screw-driver, and the paint flows over the heads, making, when dry7 a perlectlytight" joint.

By means of the screws the fibrous packing c is tightly pinched, insuring an impervious seam. It is plain that any sheet upon the roof can be readily removed for repairs, without injury either' to the metal or the roof-board, and the screws cannot be drawn out by the expansion of' the sheets.

I am also able to apply it cheaper than by the old plan, since I dispense with the 4services oi'au assistant under the roof'.

What I claim as my invention, and desire to secure l by Letters Patent, is-

I. The employment, in conneetionwith the dopublelocked seam b, of a suitable water-proof cement, t', substantially as and for the purposes set forth.

2. The herein-described method of securing the lapped end of the sheets oi' metal rooting, that is to say, by forming countersinks or recesses in the sheets, then inserting the screws part of their length, then applying a coating of paint or cement-,and screwing in the screw, so that a portion of the paint shall be under the head, and a portion shall also low over the head in the recess, as set forth.

JNO. SIDDONS.

Witnesses F. H. CLEMENT, WM. S. LoNGHBoRoUGH. 

